Electrotherapeutic treatment head



iRb- 1965 w. D. KENDALL ETAL 3,

ELECTROTHERAPEUTIC TREATMENT HEAD Filed July 2, 1962 INVENTORS BYFEANKA5652 A T EVS WILL lAM DEN/s KENDALL United States Patent 3,168,098ELECTROTHERAPEUTIC TREATIVIENT HEAD William Denis Kendall and Frank A.Yarger, Los Angeles, Calif., assignors to Dynapower Systems Corporation,

Los Angeles, Calif., a corporation of Delaware Filed July 2, 1962, Ser.No. 206,903 2 Claims. (Cl. 128-404) This invention relates generally toelectotherapeutic apparatus, and more particularly has to do withtreatment head construction facilitating voltage increase and matchingof head impedance to that of the patient undergoing treatment.

It is a major object of the invention to provide a treatment head havingnovel and advantageous construction, affording a high degree of utility.Basically, the head comprises a metallic shell having a front opening,together with an assembly in the shell including a nonmetallic partitionextending transversely within the casing and forming therewithcompartments at the front and rear of the partition. A multiple loopsecondary coil is carried in the front compartment by the partition, thelatter also carrying a variable capacitor in the rear compartment so asnot to interfere with high frequency electromagnetic pulse transmissionfrom the secondary coil to the patient. The primary coil is carried bythe partition generally between the capacitor and the secondary coil,and finally a non-metallic cover for the shell closes the front openingthereof.

The aforementioned construction facilitates reception of the assembly ofelements as a unit through the front opening of the shell when the coveris removed, variations of the capacitor being provided for by insertinga rotary shaft transversely through the shell wall for connection to therotor element of the capacitor. The cou pling between the capacitor andsecondary coil may then be adjusted to match impedance with the patientbeing treated, since the capacitor and secondary coil areinterconnected.

Other objects and advantages include the provision of a plasticpartition carrying plastic support lugs received at the front and rearsides thereof to receive and mount the turns of the secondary andprimary coils respectively, the partition also mounting anothercapacitor connected in series with the primary coil.

These and other objects and advantages of the invention, as well as thedetails of an illustrative embodiment, will be more fully understoodfrom the following detailed description of the drawing, in which:

FIGURE 1 is an elevation taken in section through the electrotherapeutichead;

FIGURE 2 is a section taken on lines 22 of FIG- URE 1;

FIGURE 3 is a section taken on lines 3-3 of FIG- URE 1;

FIGURE 4 is a section taken on line 4-4 of FIG- URE 2; and

FIGURE 5 is a circuit diagram showing the interconnection andintercoupling of the electrical components.

In the drawings the head is shown in the form of a generallycylindrically metallic shell having a front opening 11 and a closed rearwall 12 supported by a rod or similar member 13. Received through theopening 11 and into the shell interior 14 is an assembly 15 thatincludes a partition 16 which is made of plastic such as Lucite or anequivalent material. The partition extends transversely and isperipherally removably connected to the shell as by interior bracket 17and fasteners 18. The partition and shell together form front and rearinterior compartments 19 and 20, as shown.

A metallic loop secondary coil 21 extends generally transversely withinthe front compartment 19 and spirals ice about the forwardly extendingcentral axis 23. Coil 21 is supported by means such as the plastic lugs24 circularly spaced about the axis 23 and suitably bonded at 25 to thepartition front face. Lugs 24 are recessed inwardly from the front sidesthereof and at the locations 27 shown in FIGURE 4 to receive and mountthe secondary coil turns.

A variable capacitor 28 is carried by the partition 16 to lie within therear compartment 20. The capacitor includes forward and rearwardlyextending parallel stator and rotor plates 29 and 30 respectively, theformer being mounted on parallel legs 31 projecting transversely fromend panel 32. The latter is connected by fasteners 32 to a plastic block33 bonded at 34 to the rear face of partition 16. The capacitor rotorplates are mounted to a single post 35 journaled by end panel 32 forrotation. A rotary shaft is inwardly connected to the post 35 at 36, andprojects transversely through an opening 37 in the shell to a controlknob 38, whereby the rotor may be easily turned to vary the couplingbetween the capacitor and the secondary coil. As shown in FIGURE 5,suitable leads 39 and 40 interconnect the terminals of the capacitor andsecondary coil.

A primary coil or loop is shown at 41 as being carried by the plasticsupport lugs 24, which are recessed at their rear faces to receive thesingle loop. Typically, the loop is inserted in the lug recesses 42prior to bonding of the lugs to the front face of the partition 16.Accordingly, the primary is firmly located in position and along withthe secondary coil is everywhere spaced from the ferrous metallic shellwhich shields the coils against rearward and transverse transmission ofelectromagnetic radiation. At the same time, the coils are mounted bystructure which is non-metallic and offers no constraint or impedance tosuch radiation.

Finally, a non-metallic and typically plastic cover plate 43 isremovably mounted to the shell rim. The cover offers no obstruction totransmission of electromagnetic radiation through the front opening 11of the shell, which accordingly remains open to such transmission. Atthe same time, plate 43 protects the patient from contact with the highvoltage components within the shell interior.

FIGURE 5 shows a fixed capacitor 44 connected in series with the primarycoil 41 and with a high voltage pulse source 45 functioning to provide atrain of interrupted pulses transmitted to the primary coil. Thefrequency of such pulses is typically 27.12 megacycles, and they aretransmitted at regular intervals as for example .001 to .025 second. Thecapacitor 44 prevents D.C. application to the primary and is shown inFIGURE 1 as being mounted by the partition 16.

We claim:

1. An improved electrotherapeutic head, comprising a metallic shellhaving a front opening, means including a dielectric partition receivedthrough said front opening and carried by the shell to extendtransversely therein and to form therewith separate compartments at thefront and rear of said partition, a metallic multiple loop secondarycoil extending generally transversely and spaced forwardly of the rearcompartment and spiraling about a forwardly extending axis, a highvoltage capacitor having exposed plates in the rear compartment, thecapacitor and secondary coil having interconnected terminals, a lowvoltage primary coil extending generally transversely and spacedforwardly of the rear compartment and curving about said axis, thepetition being solid and dielectrically shielding both coils from thecapacitor, said means forming recesses to receive the coils, the coilshaving supported connection to said means, the capacitor being mountedat the rear side of the partition and extending within an axial cylinderpassing through the primary coil turn, and non-metallic cover for saidshell.

A head as :defined in claim 1 in which said means 7 ReferencesCited bythe Examiner i ncludecsl a series of circularlyt 1:pa fed dielfectriglugls hav UNITED STATES PATENTS ing sai recesses 0 receive e urns 0 smC01 5 an I attached to said partition, said lugs and partition com-2'171670 9/39 a k "7 128422 X prising hardened synthetic resins, thehlgs protruding from 5 10 7/62 Mflmowskl 128413 X and being bonded toItlhe forward face log the partiltiion, the FOREIGN PATENTS recesses torecelve t e secon ary coi eing sun in the r forward sides of the lugsand the recesses to receive the 613747 5 Germany: I primary coil beingsunk in the rear sides of the lugs. RICHARD DEL' y Examiner-

1. AN IMPROVEMED ELECTROTHERAPEUTIC HEAD, COMPRISING A METALLIC SHELLHAVING A FRONT OPENING, MEANS INCLUDING A DIELECTRIC PARTITION RECEIVEDTHROUGH SAID FRONT OPENING AND CARRIED BY THE SHELL TO EXTENDTRANSVERSELY THEREIN AND TO FORM THEREWITH SEPARATE COMPARTMENTS AT THEFRONT AND REAR OF SAID PARTITION, A METALLIC MULTIPLE LOOP SECONDARYCOIL EXTENDING GENERALLY TRANSVERSELY AND SPACED FORWARDLY OF THE REARCOMPARTMENT AND SPIRALING ABOUT A FORWARDLY EXTENDING AXIS, A HIGHVOLTAGE CAPACITOR HAVING EXPOSED PLATES IN THE REAR COMPARTMENT, THECAPACITOR AND SECONDARY COIL HAVING INTERCONNECTED TERMINALS, A LOWVOLTAGE PRIMARY COIL EXTENDING GENERALLY TRANSVERSELY AND SPACEDFORWARDLY OF THE REAR COMPARTMENT AND CURVING ABOUT SAID AXIS, THEPETITION BEING SOLID AND DIELECTRICALLY SHIELDING BOTH COILS FROM THECAPACITOR, SAID MEANS FORMING RECESS TO RECEIVE THE COILS, THE COILSHAVING SUPPORTED CONNECTION TO SAID MEANS, THE CAPACITOR BEING MOUNTEDAT THE REAR SIDE OF THE PARTITION AND EXTENDING WITHIN AN AXIAL CYLINDERPASSING THROUGH THE PRIMARY COIL TURN, AND NON-METALLIC COVER FOR SAIDSHELL.